noun Something which or someone who impels. A rotating component of a device that accelerates fluid, increasing its pressure or flowrate.
screw impeller
noun A rotating component of a device that accelerates fluid, increasing its pressure or flowrate.
screw impeller
noun Especially, such a component that drives the fluid radially (outward from a center of rotation) rather than axially. (Impellers are found in devices such as pumps, water jets, washing machines, and agitated tanks.)